Yes, but DIAL requires a centralized registry of whitelisted apps (and they're using their own registry for ChromeCast, not the dial-multiscreen.com one); my reading is that Google is un-whitelisting any apps that allow streaming of local media.

Honestly, it's really silly since the built-in Chrome casting webapp is basically "throw arbitrary content at the screen via WebRTC" -- so hypothetically you could write a local WebRTC client that pushed your local video content to the device (and sidestep any whitelist restrictions). Unfortunately, WebRTC looks like a needlessly complicated protocol to implement.